Stapler



FIG. 1 is a front, left side and top perspective view showing my new design.

FIG. 2 is a back, left side and top perspective view.

FIG. 3 is a front, right side and bottom perspective view.

FIG. 4 is a left side view; and,

FIG. 5 is a top view.

The broken lines shown the drawings form no part of the claimed design. 

The ornamental design for a stapler, as shown and described. 